KR20090012661A - Hybridized pigment complex with enhanced uv shielding effects, new physical properties and the manufacturing method thereof - Google Patents

Abstract

A manufacturing method of complex poly silicon material is provided to improve mass property and use feeling using poly silicon having elasticity, soft feeling, excellent use feeling and not giving stimulus to the skin and to have new property and ultraviolet protection function. A manufacturing method of complex poly silicon material comprises steps of: (i) fixing titanium dioxide, zinc oxide and plate shape pulverized body at a surface of a silicon high polymer powder using a binder under a solvent; and (ii) adding strong shear at the step (i) and re-dispersing it. An average particle size of the silicon high polymer powder of the step (i) is 0.1-50 um. The inorganic plate quality pulverized body is one or more selected from talc, mica, sericite, titanium oxide particle and zinc oxide.

Description

Hybridized pigment complex with enhanced UV shielding effects, new physical properties and the manufacturing method

The present invention improves the ultraviolet ray blocking ability of the properties of titanium dioxide and zinc oxide as inorganic substances, and cosmetic composites prepared by using a plate-shaped and spherical organic and inorganic supplements to solve the whitening phenomenon and spreadability, which are disadvantages as external preparations for skin. A technique and a cosmetic containing the same. Titanium dioxide and zinc oxide, which are generally used, exhibit UV protection properties due to their inherent physical properties. Substances exhibiting UV protection properties are classified into organic UV absorbers that absorb ultraviolet rays and convert energy into other forms, and inorganic UV absorbers that absorb and scatter UV rays. Among them, titanium dioxide and zinc oxide are representative of inorganic UV blockers. It is a substance and is the sunscreen that is mainly used now. Organic UV absorbers are mainly used to protect the UVB region 290 ~ 320, and the development of a material that protects UVA, a wavelength region of 320 ~ 400nm is rare. In addition, due to the problem of poor skin safety and long-lasting UV protection, there is a limit to the concentration used. However, titanium dioxide and zinc oxide, which are inorganic sunscreens, have been spotlighted as useful materials because they absorb and scatter in a wide ultraviolet wavelength range. However, since the whiteness is high by scattering light in the visible light region, natural makeup finish is difficult and spreadability during application of the skin has a disadvantage in feeling.

The UV blocking ability of the inorganic blocking agent is as follows. When ultraviolet light is incident, titanium dioxide and zinc oxide are excited from a low energy state to a high energy state. This occurs when the energy of incident light is greater than the energy gap of each material. Rutile titanium dioxide has an energy gap of 3.06 eV, and zinc oxide has an energy gap of 3.23 eV. This is because titanium dioxide corresponds to a wavelength of 405nm, zinc oxide is 385nm, titanium dioxide absorbs ultraviolet rays shorter than 405nm wavelength, zinc oxide absorbs ultraviolet rays shorter than 385nm wavelength. On the other hand, titanium dioxide scatters ultraviolet rays having a wavelength longer than 405 nm, and zinc oxide scatters ultraviolet rays having a wavelength longer than 385 nm. Therefore, it is important to develop a material that improves the disadvantages while taking advantage of the inorganic sunscreen. Titanium dioxide or zinc oxide, developed as an inorganic sunscreen, exhibited a wide range of sunscreen effects, but there were many difficulties in terms of functionality and feeling of use in cosmetic formulations. Generally, titanium dioxide or zinc oxide, which has been developed in general, has a particle diameter of less than 1 micrometer. These particles are not only effective at blocking UV rays but also do not scatter visible light. However, particles larger than 1 micro scatter light in the visible region, causing a so-called white clouding phenomenon. Therefore, a technique for producing titanium dioxide and zinc oxide having a small particle size has been developed. In addition, a technology for coating the surface has been developed to solve the photoactivity caused by the shrinking of the particles. However, titanium dioxide and zinc oxide form primary particles and easily form associations through a series of manufacturing processes such as drying and crushing the particles. These associations reassociate with each other due to electrostatic attraction to form larger particles. These associations lower the UV blocking ability and increase the clouding phenomenon. In recent years, distributed systems have been developed to solve these problems. This is to improve dispersibility by dispersing the aggregate of particles by applying a strong shearing force using an appropriate dispersing medium and a dispersing agent in order to increase the dispersibility of the particles. At the same time, it stabilizes the dispersed state for a long time and keeps the particle size constant. However, a stable dispersion system that is practically applicable to various sunscreen formulations has not been developed. For this reason, in order to prevent agglomeration of particles, it has been developed that the final dispersion state is a high viscosity gel state using an ester oil having a high melting point (US patent No. 6,261,713). As a result of showing a stable state at room temperature, when the temperature rises, the aggregation of particles occurs due to an increase in the activity of molecular motion, resulting in a decrease in the effect of UV blocking due to the aggregation of particles in the environment during the manufacture of cosmetics, and a clouding phenomenon. In general, the particles can be stably maintained in the dispersed state, but when contained in the cosmetic formulation, the stabilized state of the particles is disturbed by various oils, surfactants, and the like, so that the particles of titanium dioxide and zinc oxide are substantially used in the cosmetic formulation. It can be seen that maintaining a stable dispersed state becomes quite difficult.

Accordingly, the present invention aims to develop a system capable of preventing agglomeration of titanium dioxide and zinc oxide, which are inorganic blocking agents, and to secure stability. Technology for producing composite materials by hybridizing titanium dioxide and zinc oxide particles with silicone polymer with elasticity, soft touch, excellent feeling, and no skin irritation, shaping, smooth use feeling, and adhesive plate-like sieving powder. Developed.

Titanium dioxide and zinc oxide were first fixed to a spherical silicone polymer carrier, and then a strong sheath was applied to find a cosmetic UV composite material in which a plate-like sieving pigment was secondarily fixed. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a composite material that maintains the usability and particle dispersibility of titanium dioxide or zinc oxide to improve the UV blocking ability and at the same time maintain the particle dispersibility stably. It is still another object of the present invention to provide a cosmetic containing this composite agent, having excellent malleability and skin adhesion and having a smooth feeling of use.

In order to achieve the above object, the method for producing a composite titanium dioxide and zinc oxide material according to the present invention comprises the steps of (i) fixing titanium dioxide or zinc oxide on the surface of a silicon polymer using a binder in a solvent; and (i) redispersing by applying a strong sheer in step i). The step of fixing and redistributing the plate pigment to the outside through steps of (i) and (ii).

In addition, the cosmetic composition of the present invention is characterized in that it contains a titanium dioxide, zinc oxide composite preparation prepared by the above method at 0.5-60% by weight relative to the total weight of the composition.

Hereinafter, a method of manufacturing titanium dioxide and zinc oxide composite silicon polymer powder will be described for each step.

(1) fixing titanium dioxide or zinc oxide on the surface of the silicone polymer powder using a binder in a solvent;

After dispersing the silicone polymer powder by applying a shearing force in a solvent, the binder is wetted and then mixed with titanium dioxide or zinc oxide, followed by filtration and drying to prepare pulverized powder.

The silicon polymer powder used in the present invention preferably has a particle size of 0.1-50 um, and more preferably a particle size of 0.2-30 um. If the thickness is less than 0.1 um, titanium dioxide, zinc oxide and plate-like particles are sufficiently deposited on the surface thereof. It is because it cannot coat | cover and if the average particle diameter exceeds 50 micrometers, the fluidity | liquidity and dispersibility of the obtained composite material powder will be inferior.

Specific examples of the silicone polymer powder used in the present invention include Trefil E-602 (particle size 5 um), Trefil E-603 (particle size 5 um), Trefil E-601 (particle size 5 um) and Trefil E-600 by Toray Dow Corning Co., Ltd. Methyl polysiloxane powder, such as (5 micrometers of particle diameters), The shape may be spherical shape, rod shape, plate shape, irregular shape, etc.

The plate-like sieving powder used in the present invention is talc, mica, kaolin, mica titanium, plate-like titanium dioxide, and the like, and the outer shape is not a problem, and the size thereof is not particularly limited. However, the shear energy and hybridization stage may vary depending on the particle size. Titanium dioxide or zinc oxide should be coated with titanium dioxide or zinc oxide to prevent light activity.

The solvent used in the present invention is tetrahydrofuran, isopropyl alcohol, ethanol, 1,4 dioxane and the like.

As the binder used in the present invention, a silicone surfactant is a dimethicone copolyol or an EO addition silicone surfactant.

(2) redispersing and hybridizing by applying a strong shear force.

After dispersing the silicone polymer powder by applying a shearing force under a solvent, wetting the binder, compounding with titanium dioxide or zinc oxide, compounding, filtering and drying the ground powder, ball mill, into mill, screen mill, pot mill, Hens mixer, hybridizer, etc. When pulverized and redispersed sufficiently using the same mixing grinder, the plate-like powder is firmly fixed to the surface of the silicon polymer by the heat generated by friction during the crushing mixing process, but if necessary, the pulverized mixture is heated by an appropriate heating means to make it stronger. Sticks. The heating temperature is not particularly limited but is preferably in the range of 40-95 degrees and more preferably in the range of 60-90 degrees.

Composite silicon polymer powder produced by the method of the present invention is titanium dioxide, zinc oxide, talc. Rather than directly coating plate-like powders such as mica, a solvent is used to improve the dispersion of silicon polymers, and then a kind of binder or binding enhancer between the composite silicon polymer powder and plate-like powders such as titanium dioxide, zinc oxide, talc or mica. The dimethicone copolymer is coated with a dimethicone copolymer, and the mechanism is that a silanol group, a silicon atom bonded hydrogen atom, or a silicon atom bonded alkoxy group on the surface of the silicon polymer interacts with an oxide group of the dimethicone copolymer.

Titanium dioxide and zinc oxide composite material of the present invention prepared as described above is excellent in water repellency and coating stability can be formulated and used in cosmetics as it is, but according to the needs of the formulation to improve the water repellency, dispersibility, feeling, etc. Various surface treatments such as gum treatment, silicon treatment, fluorine compound treatment and acyl amino acid treatment may be further performed.

The composite silicone polymer powder prepared by the above-described method may be combined with a base used in cosmetics, quasi-drugs, and external medicines that are generally used to obtain a cosmetic composition.

Powders of the general cosmetic composition of the present invention include organic pigments such as mica, talc, sericite, kaolin, nylon powder, inorganic pigments such as pearl, red 202, red 226, yellow 4, aluminum lake, etc. It may contain pigments and inorganic powders such as various known zirconium oxides, iron oxides, and the like, and may contain silicon-treated, metal-quartz gum, N-acyl amino, and fluorinated powders. Examples of the emulsion include solid or liquid hydrocarbons such as paraffin, crystal oil and seretine, vegetable oils such as olive oil and lanolin, fatty acids such as stearic acid and palmitic acid and esters thereof, and silicone oils such as methyl polysiloxane, methylphenylsiloxane and dimethylcyclopolysiloxane. And alcohols such as ethyl alcohol isopropyl alcohol and cetyl alcohol. Examples of the moisturizing agent may include polyhydric alcohols such as glycol, glycerin or sorbitol.

Although the formulation of the cosmetic composition of the present invention is not particularly limited, it may be formulated into a formulation such as makeup cosmetics such as cream, oil, and powder products.

Example 1

30 g of silicon polymer powder having an average particle diameter of 5 um was first dispersed in 500 g of tetrahydrofuran, 0.04 g of dimethicone copolymer was added thereto, 70 g of titanium dioxide or zinc oxide was added, compounded, filtered, and dried sufficiently at 70-90 degrees. And grind.

The first composite powder was placed in a rotary ball mill and treated for 3 hours to obtain a second composite silicone polymer powder.

Example 2

The composite material prepared in Example 1 was dispersed in a solvent in the same manner as in Example 1, and then 20 g of mica having a plate-shaped powder average particle diameter (0.5-5 um) was used in the same manner as in Example 1. It manufactured and obtained the composite material.

As a result of electron microscope observation, it was confirmed that titanium dioxide and mica were stably coated on the surface of the silicon polymer.

Comparative Example 1

40g of spherical silicon polymer powder with an average particle diameter of 5um and 60g of titanium dioxide were mixed with a laboratory hands mixer for about 1 minute, and then mixed into a rotary ball mill for 3 hours, and then composited into a secondary polymer. Got.

Comparative Example 2

40 g of spherical silicon polymer powder having an average particle diameter of 5 μm was first dispersed in 500 g of tetrahydrofuran, and 60 g of titanium dioxide was added thereto, compounded, filtered and sufficiently dried and ground at 70-90 degrees. The first composite powder was placed in a rotary ball mill and treated for 3 hours to obtain a second composite silicone polymer powder.

In the composite material prepared in Comparative Examples 1) and 2), it was found that the titanium dioxide fixed by the weak shearing force was easily separated due to the absence of the binder.

As described through the above Examples and Experimental Examples, the present invention relates to a technology for producing a composite material by hybridizing with a plate-like sieve powder having excellent adhesion. The titanium dioxide or zinc oxide particles have elasticity, feel is soft, and the feel is comfortable. It is a very useful invention as a new powder material that improves the formation and use feeling by using a silicone polymer which is excellent and does not cause skin irritation.

Claims (5)

(i) fixing titanium dioxide, zinc oxide and plate-like powder to the surface of the silicone polymer powder using a binder in a solvent; (ii) applying a strong shear in the step (i) to redispersing Method for producing a composite silicone polymer material. The method of claim 1, wherein the average particle diameter of the silicon polymer powder in the step (i) is 0.1-50 um. The method of producing a composite silicone polymer powder according to claim 1, wherein the inorganic plate-like powder is at least one selected from talc, mica, sericite, titanium oxide fine particles, zinc oxide, and the like. The method according to claim 1, wherein the first step is to coat titanium dioxide or zinc oxide, and then secondly to coat the plate powder. A cosmetic composition for makeup and basics, comprising 0.5-60% by weight of the composite silicone polymer powder prepared by the method of claim 1.